I am always paranoid when it comes to technology and money, and this will be no exception. BLE (Bluetooth Low Energy) has been around for 2-3 years now, but I still consider it to be in it's infancy. This is especially true when it comes to security. A quick Google Search produced two examples [1] and [2] of potential security flaws with BLE pairing and authentication, and I'm sure there are many more I'm not aware of. Building new payment technology based on new and cutting edge communication frameworks does sound exotic and cool. It's probably one of those "cool points" that gets investors excited. But for the security minded folks out there, this is likely a red flag. Instead I see it as building payment related technology on an un-proven communication framework, and it just does not sound like a great idea. And it is because of this that I will probably never personally use something like Coin regardless of how useful it might be. All it takes is one person to create an effective exploit, and there goes both your money and your trust in the Service. In any event, good luck to Coin with this new Product, and I hope they prove me wrong. If they are looking for a recommendation (which I'm sure they're not), I would recommend a sharp focus on securing the BLE connections between the Coin Wallet and the Smartphone Device.